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Document And Entity Information - shares	9 Months Ended
Document And Entity Information - shares	Sep. 30, 2012	Nov. 02, 2012
Common Class A [Member]
Entity Common Stock, Shares Outstanding		27,933,473
Common Class B [Member]
Entity Common Stock, Shares Outstanding		10,792,223
Entity Registrant Name	RUSH ENTERPRISES INC \TX\
Document Type	10-Q
Current Fiscal Year End Date	--12-31
Amendment Flag	false
Entity Central Index Key	0001012019
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Accelerated Filer
Entity Well-known Seasoned Issuer	No
Document Period End Date	Sep. 30, 2012
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	Q3

Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 230,303	$ 207,775
Accounts receivable, net	92,141	98,160
Inventories, net	715,868	649,626
Prepaid expenses and other	4,159	12,158
Deferred income taxes, net	12,253	12,286
Total current assets	1,054,724	980,005
Investments	6,628	6,628
Property and equipment, net	572,203	499,667
Goodwill, net	180,918	182,612
Other assets, net	48,455	48,789
Total assets	1,862,928	1,717,701
Current liabilities:
Floor plan notes payable	575,211	520,693
Current maturities of long-term debt	70,817	63,465
Current maturities of capital lease obligations	10,706	10,056
Trade accounts payable	65,957	62,299
Accrued expenses	91,863	134,278
Total current liabilities	814,554	790,791
Long-term debt, net of current maturities	304,989	264,822
Capital lease obligations, net of current maturities	37,294	35,498
Other long-term liabilities	2,142	2,233
Deferred income taxes, net	112,468	93,123
Shareholders' equity:
Preferred stock, par value $.01 per share; 1,000,000 shares authorized; 0 shares outstanding in 2012 and 2011	0	0
Common stock, par value $.01 per share; 60,000,000 class A shares and 20,000,000 class B shares authorized; 27,930,139 class A shares and 10,792,223 class B shares outstanding in 2012; and 27,406,424 class A shares and 10,776,697 class B shares outstanding in 2011	404	398
Additional paid-in capital	220,519	208,569
Treasury stock, at cost: 1,639,843 class B shares	(17,948)	(17,948)
Retained earnings	390,401	342,164
Accumulated other comprehensive loss, net of tax	(1,895)	(1,949)
Total shareholders' equity	591,481	531,234
Total liabilities and shareholders' equity	$ 1,862,928	$ 1,717,701

Consolidated Balance Sheets (Parentheticals) - $ / shares	Sep. 30, 2012	Dec. 31, 2011
Common Class A [Member]
Common stock, shares authorized	60,000,000	60,000,000
Common stock, shares outstanding	27,930,139	27,406,424
Common Class B [Member]
Common stock, shares authorized	20,000,000	20,000,000
Common stock, shares outstanding	10,792,223	10,776,697
Preferred stock, par value (in Dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares outstanding	0	0
Common stock, par value (in Dollars per share)	$ 0.01	$ 0.01
Treasury stock, shares	1,639,843	1,639,843

Consolidated Statements of Income and Comprehensive Income (Unaudited) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Revenues:
New and used truck sales	$ 502,595,000	$ 487,324,000	$ 1,652,743,000	$ 1,231,439,000
Parts and service	210,749,000	182,585,000	615,685,000	498,532,000
Lease and rental	26,188,000	21,436,000	73,097,000	60,984,000
Finance and insurance	3,444,000	2,902,000	10,158,000	7,614,000
Other	2,157,000	2,198,000	6,623,000	5,962,000
Total revenue	745,133,000	696,445,000	2,358,306,000	1,804,531,000
Cost of products sold:
New and used truck sales	469,302,000	452,919,000	1,539,126,000	1,147,987,000
Parts and service	128,901,000	111,849,000	374,774,000	304,014,000
Lease and rental	21,759,000	17,889,000	61,339,000	50,842,000
Total cost of products sold	619,962,000	582,657,000	1,975,239,000	1,502,843,000
Gross profit	125,171,000	113,788,000	383,067,000	301,688,000
Selling, general and administrative	91,270,000	79,714,000	275,968,000	224,715,000
Depreciation and amortization	6,323,000	5,771,000	18,262,000	14,492,000
Gain on sale of assets	49,000	25,000	136,000	457,000
Operating income	27,627,000	28,328,000	88,973,000	62,938,000
Interest expense, net	3,383,000	1,894,000	10,094,000	4,694,000
Income from before taxes	24,244,000	26,434,000	78,879,000	58,244,000
Provision for income taxes	9,335,000	10,389,000	30,642,000	22,414,000
Net income	$ 14,909,000	$ 16,045,000	$ 48,237,000	$ 35,830,000
Earnings per common share:
Basic (in Dollars per share)	$ 0.38	$ 0.42	$ 1.25	$ 0.95
Diluted (in Dollars per share)	$ 0.38	$ 0.41	$ 1.22	$ 0.92
Weighted average shares outstanding:
Basic (in Shares)	38,740,275	37,932,300	38,602,099	37,796,072
Diluted (in Shares)	39,602,188	38,958,898	39,632,878	38,955,468
Comprehensive income	$ 14,958,000	$ 15,449,000	$ 48,291,000	$ 34,154,000

Consolidated Statements of Cash Flows (Unaudited) - USD ($)	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Cash flows from operating activities:
Net income	$ 48,237,000	$ 35,830,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	53,196,000	41,220,000
Gain on sale of property and equipment	(136,000)	(457,000)
Stock-based compensation expense related to stock options and employee stock purchases	6,045,000	4,756,000
Provision (benefit) for deferred income tax expense	19,341,000	16,560,000
Excess tax benefits from stock-based compensation	(1,433,000)	(1,244,000)
Change in accounts receivable, net	6,019,000	(29,536,000)
Change in inventories	(49,735,000)	(161,532,000)
Change in prepaid expenses and other, net	7,999,000	8,813,000
Change in trade accounts payable	3,658,000	16,513,000
Draws on floor plan notes payable – trade, net	36,790,000
Change in accrued expenses	(40,982,000)	18,580,000
Net cash provided by(used in) by operating activities	88,999,000	(50,497,000)
Cash flows from investing activities:
Acquisition of property and equipment	(130,057,000)	(100,382,000)
Proceeds from the sale of property and equipment	1,156,000	10,526,000
Business acquisitions	(36,000)	(60,038,000)
Change in other assets	(729,000)	(82,000)
Net cash (used in) investing activities	(129,666,000)	(149,976,000)
Cash flows from financing activities:
Draws on floor plan notes payable – non-trade, net	17,728,000	186,347,000
Proceeds from long-term debt	102,731,000	86,662,000
Principal payments on long-term debt	(55,212,000)	(52,214,000)
Principal payments on capital lease obligations	(7,963,000)	(10,166,000)
Debt issuance costs		(96,000)
Excess tax benefits from stock-based compensation	1,433,000	1,244,000
Proceeds from issuance of shares relating to employee stock options and employee stock purchases	4,478,000	2,965,000
Net cash provided by financing activities	63,195,000	214,742,000
Net increase in cash and cash equivalents	22,528,000	14,269,000
Cash and cash equivalents, beginning of period	207,775,000	168,976,000
Cash and cash equivalents, end of period	230,303,000	183,245,000
Cash paid during the period for:
Interest	17,553,000	10,573,000
Income taxes, net of refunds	3,271,000	(2,709,000)
Noncash investing activities:
Assets acquired under capital leases	$ 10,409,000	$ 11,342,000

Note 1 - Principles of Consolidation and Basis of Presentation

9 Months Ended

Sep. 30, 2012

Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]

1 – Principles of Consolidation and Basis of Presentation

The interim consolidated financial statements included herein have been prepared by Rush Enterprises, Inc. and its subsidiaries (collectively referred to as the “Company”), without audit, pursuant to the rules and regulations of the Securities and Exchange Commission (the “SEC”). All adjustments have been made to the accompanying interim consolidated financial statements, which, in the opinion of the Company's management, are necessary for a fair presentation of the Company's operating results. All adjustments are of a normal recurring nature. Certain information and footnote disclosures normally included in financial statements prepared in accordance with generally accepted accounting principles have been condensed or omitted pursuant to such rules and regulations. It is recommended that these interim consolidated financial statements be read in conjunction with the consolidated financial statements and the notes thereto included in the Company's Annual Report on Form 10-K for the year ended December 31, 2011. Results of operations for interim periods are not necessarily indicative of results that may be expected for any other interim periods or the full fiscal year.

- Definition

The entire disclosure for organization, consolidation and basis of presentation of financial statements disclosure.

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+ Details

Note 2 - Goodwill and Other Intangible Assets

9 Months Ended

Sep. 30, 2012

Goodwill and Intangible Assets Disclosure [Text Block]

2 – Goodwill and Other Intangible Assets

In August 2011, the Company determined that the SAP enterprise software and SAP dealership management system were ready for their intended use, placed them in service and began amortization of the capitalized costs of the software. The Company is currently operating several Rush Truck Centers in Texas and a majority of its leasing operations on the SAP enterprise software and SAP dealership management system. The Company plans to convert all of its Rush Truck Centers and leasing operations to the SAP enterprise software and SAP dealership management system by the end of 2014.

The total capitalized costs of the SAP enterprise software and SAP dealership management system of $41.0 million, including capitalized interest, are recorded on the Consolidated Balance Sheet in Other Assets, net of accumulated amortization of $3.3 million. Amortization expense of $0.7 million is included in depreciation and amortization expense for the three months ended September 30, 2012, and $2.2 million for the nine months ended September 30, 2012. The SAP software will be amortized over a period of 15 years resulting in amortization expense of approximately $2.9 million per year. Additional enhancements to the SAP software will be capitalized and amortized over the remaining life of the asset.

Other Assets on the Consolidated Balance Sheet include manufacturer franchise rights of $4.5 million at September 30, 2012, and $2.8 million at December 31, 2011.

Goodwill is the excess of the purchase price over the fair value of identifiable net assets acquired in business combinations accounted for under the purchase method. The Company does not amortize goodwill or other indefinite-lived intangible assets, but tests goodwill for impairment annually in the fourth quarter, or when indications of potential impairment exist. These indicators would include a significant change in operating performance, or a planned sale or disposition of a significant portion of the business, among other factors. The Company tests for goodwill impairment utilizing a fair value approach at the reporting unit level. A reporting unit is an operating segment, for which discrete financial information is prepared and regularly reviewed by segment management. The Company has deemed its reporting unit to be the Truck Segment, which is the level at which management regularly reviews operating results and makes resource allocation decisions.

The fair market value of the Company's manufacturer franchise rights, which are included in Other Assets on the accompanying consolidated balance sheets, is determined at the acquisition date through discounting the projected cash flows specific to each franchise. The Company has determined that manufacturer franchise rights have an indefinite life as there are no economic or other factors that limit their useful lives, and they are expected to generate cash flows indefinitely due to the historically long lives of the manufacturers' brand names. Furthermore, to the extent that any agreements evidencing manufacturer franchise rights would expire, the Company expects that it would be able to renew those agreements in the ordinary course of business. Due to the fact that manufacturer franchise rights are specific to geographic region, the Company has determined that the geographic region is the appropriate level for purposes of testing franchise rights for impairment. The Company does not amortize franchise rights, but tests for impairment annually in the fourth quarter, or when indications of potential impairment exist.

The impairment test for goodwill involves comparing the fair value of a reporting unit to its carrying amount, including goodwill. If the carrying amount of the reporting unit exceeds its fair value, a second step is required to measure the goodwill impairment loss. The second step includes hypothetically valuing all the tangible and intangible assets of the reporting unit as if the reporting unit had been acquired in a business combination. Then, the implied fair value of the reporting unit's goodwill is compared to the carrying amount of that goodwill. If the carrying amount of the reporting unit's goodwill exceeds the implied fair value of the goodwill, the Company would recognize an impairment loss in an amount equal to the excess, not to exceed the carrying amount. The Company determines the fair values calculated in an impairment test using the discounted cash flow method, which requires assumptions and estimates regarding future revenue, expenses and cash flow projections. The analysis is based upon available information regarding expected future cash flows of its reporting unit discounted at rates consistent with the cost of capital specific to the reporting unit.

No impairment write down of the Company's goodwill was required in the fourth quarter of 2011. However, the Company cannot predict the occurrence of certain events that might adversely affect the reported value of goodwill or manufacturer franchise rights in the future.

The following table sets forth the change in the carrying amount of goodwill for the Company for the period ended September 30, 2012:

Balance January 1, 2012	$	182,612
Adjustment to acquisition of Peck Road Ford		36
Adjustment for franchise rights related to West Texas Peterbilt acquisition		(1,730	)
Balance September 30, 2012	$	180,918

On December 5, 2011, the Company acquired certain assets of West Texas Peterbilt, which consisted of dealerships in Amarillo, Lubbock and Odessa, Texas that offer Peterbilt trucks, parts, service, financing and insurance, a parts and service facility in Dalhart, Texas and a parts facility in Hereford, Texas. The final purchase price allocation includes an adjustment to goodwill of $1.7 million due to the finalization of the franchise rights valuation during the second quarter of 2012.

- Definition

The entire disclosure for the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain (loss) on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss.

+ References + Details

Note 3 - Commitments and Contingencies

9 Months Ended

Sep. 30, 2012

Commitments and Contingencies Disclosure [Text Block]

3 – Commitments and Contingencies

The Company is involved in various claims and legal actions arising in the ordinary course of business. The Company believes it is unlikely that the final outcome of any of the claims or proceedings to which the Company is a party would have a material adverse effect on the Company's financial position or results of operations; however, due to the inherent uncertainty of litigation, there can be no assurance that the resolution of any particular claim or proceeding would not have a material adverse effect on the Company's results of operations for the fiscal period in which such resolution occurred.

- Definition

The entire disclosure for commitments and contingencies.

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+ Details

Note 4 - Earnings Per Share

9 Months Ended

Sep. 30, 2012

Earnings Per Share [Text Block]

4 – Earnings Per Share

The following table sets forth the computation of basic and diluted earnings per share:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2012		2011		2012		2011
Numerator:
Numerator for basic and diluted earnings per share – Net income available to common shareholders	$	14,909,000	$	16,045,000	$	48,237,000	$	35,830,000

Denominator–
Denominator for basic earnings per share – weighted average shares outstanding		38,740,275		37,932,300		38,602,099		37,796,072
Effect of dilutive securities– Employee and director stock options and restricted share awards		861,913		1,026,598		1,030,779		1,159,396
Denominator for diluted earnings per share – adjusted weighted average shares outstanding and assumed conversions		39,602,188		38,958,898		39,632,878		38,955,468

Basic earnings per common share	$	.38	$	.42	$	1.25	$	.95

Diluted earnings per common share and common share equivalents	$	.38	$	.41	$	1.22	$	.92

Options to purchase shares of common stock that were outstanding for the three months and nine months ended September 30, 2012 and 2011 that were not included in the computation of diluted earnings per share because the effect would have been anti-dilutive are as follows:

Three Months Ended

September 30,

Nine months Ended

September 30,

2012

2011

2012

2011

Anti-dilutive options

1,367,044

684,645

1,126,795

536,100

Note 5 - Stock Options and Restricted Stock Awards

9 Months Ended

Sep. 30, 2012

Disclosure of Compensation Related Costs, Share-based Payments [Text Block]

5 – Stock Options and Restricted Stock Awards

Valuation and Expense Information

The Company accounts for stock-based compensation in accordance with Accounting Standards Codification (“ASC”) 718-10, “Compensation – Stock Compensation,” which requires the measurement and recognition of compensation expense for all share-based payment awards made to the Company's employees and directors including employee stock options, restricted share awards and employee stock purchases related to the Employee Stock Purchase Plan based on estimated fair values. Stock-based compensation expense, calculated using the Black-Scholes option-pricing model and included in selling, general and administrative expense, was $1.2 million for the three months ended September 30, 2012, and $0.9 million for the three months ended September 30, 2011. Stock-based compensation expense, included in selling, general and administrative expense, for the nine months ended September 30, 2012, was $6.0 million and for the nine months ended September 30, 2011, was $4.8 million. As of September 30, 2012, there was $11.5 million of total unrecognized compensation cost related to non-vested share-based compensation arrangements to be recognized over a weighted-average period of 2.2 years.

- Definition

The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details.

+ References

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-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 14

Reference 7: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph 64, 65, A240
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Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Statement of Position (SOP)
-Number 93-6
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Note 6 - Financial Instruments and Fair Value

9 Months Ended

Sep. 30, 2012

Fair Value Disclosures [Text Block]

6 – Financial Instruments and Fair Value

Certain methods and assumptions were used by the Company in estimating the fair value of financial instruments at September 30, 2012. The carrying value of current assets and current liabilities approximates the fair value due to the short maturity of these items.

The fair value of the Company's long-term debt is based on secondary market indicators and is categorized in Level 2 of the fair value hierarchy. Since the Company's debt is not quoted, estimates are based on each obligation's characteristics, including remaining maturities, interest rate, credit rating, collateral, amortization schedule and liquidity. The carrying amount approximates fair value.

In prior years, the Company invested in interest-bearing short-term investments primarily consisting of investment-grade auction rate securities classified as available-for-sale and reported at fair value. These types of investments were designed to provide liquidity through an auction process that reset the applicable interest rates at predetermined periods ranging from 1 to 35 days. This reset mechanism was intended to allow existing investors to continue to own their respective interest in the auction rate security or to gain immediate liquidity by selling their interests at par.

As a result of the liquidity issues experienced in the global capital markets, auctions for investment grade securities held by the Company have failed. An auction fails when there is insufficient demand. However, a failed auction does not represent a default by the issuer. The auction rate securities continue to pay interest in accordance with the terms of the underlying security; however, liquidity will be limited until there is a successful auction or until such time as other markets for these investments develop. The Company has the intent and ability to hold these auction rate securities until liquidity returns to the market. The Company does not believe that the lack of liquidity relating to its auction rate securities will have a material impact on its ability to fund operations.

If investments are deemed to be impaired, the Company determines whether the impairment is temporary or other than temporary. If the impairment is deemed to be temporary, the Company records an unrealized loss in other comprehensive income. If the impairment is deemed other than temporary, the Company records the impairment in the Company's consolidated statement of operations.

As of September 30, 2012, the Company held auction rate securities with underlying tax-exempt municipal bonds that mature in 2030 that have a fair value of $6.6 million and a cost basis of $7.6 million. These bonds have credit wrap insurance and a credit rating of Aa3 by a major credit rating agency.

The Company valued the auction rate securities at September 30, 2012 using a discounted cash flow model based on the characteristics of the individual securities, which the Company believes yields the best estimate of fair value. The first step in the valuation included a credit analysis of the security which considered various factors including the credit quality of the issuer, the instrument's position within the capital structure of the issuing authority, and the composition of the authority's assets including the effect of insurance and/or government guarantees. Next, the future cash flows of the instruments were projected based on certain assumptions regarding the auction rate market significant to the valuation including the auction rate market will remain illiquid and auctions will continue to fail causing the interest rate to be the maximum applicable rate. This assumption resulted in discounted cash flow analysis being performed through 2019, the point at which the Company estimates the securities will be redeemed by the municipality. The projected cash flows were then discounted using the applicable yield curve plus a 225 basis point liquidity premium added to the applicable discount rate.

The Company recorded a pre-tax impairment charge of $1.0 million on these investments in 2011. The Company believes that the impairment is temporary and has recognized the impairment in accumulated other comprehensive loss.

The table below presents disclosures about the auction rate securities measured at fair value on a recurring basis in the Company's financial statements as of September 30, 2012 and December 31, 2011 (in thousands):

At September 30, 2012

Fair Value Estimated Using

Cost Basis
Amount

Level 1
Inputs

Level 2
Inputs

Level 3
Inputs

Investment in auction rate securities

7,575

−

6,628

At December 31, 2011

Fair Value Estimated Using

Cost Basis
Amount

Level 1
Inputs

Level 2
Inputs

Level 3
Inputs

Investment in auction rate securities

7,575

−

6,628

Interest Rate Swap Agreements

The Company has entered into swap agreements to hedge against the potential impact of increases in interest rates on its floating-rate debt instruments. Swap agreements that hedge exposures to changes in interest rates expose us to credit risk and market risk. Credit risk is the potential failure of the counterparty to perform under the terms of the swap agreement. The Company attempts to minimize this risk by entering into transactions with high-quality counterparties. Market risk is the potential adverse effect on the value of the swap agreement that results from a decline in interest rates. The market risk associated with interest-rate contracts is managed by establishing and monitoring parameters that limit the types and degree of market risk that may be undertaken.

At September 30, 2012, the Company had an aggregate $42.6 million notional amount of interest rate swap contracts, which have been designated as cash flow hedges, to pay fixed rates of interest and receive a floating interest rate based on LIBOR. The fixed interest rates specified in the interest rate swap contracts became effective on or about January 1, 2012. The Company's interest rate swaps qualify for cash flow hedge accounting treatment. Unrealized gains or losses are recorded in accumulated other comprehensive income. Realized gains and losses will be recognized in interest expense, if they occur. Amounts to be received or paid under the contracts will be recognized as interest expense over the life of the contracts. There was no ineffectiveness for these swaps during the quarters ended September 30, 2011 and September 30, 2012.

The fair value of cash flow hedges is calculated as the present value of expected future cash flows, determined on the basis of forward interest rates and present value factors. As such, the carrying amounts for these swaps are designated to be Level 2 fair values and totaled $2.1 million as of September 30, 2012. The carrying value of these swaps is included in Other Long-Term Liabilities on the accompanying Consolidated Balance Sheet as of September 30, 2012.

As of September 30, 2012, the Company was party to derivative financial instruments as described in the following table (in thousands):

Agreement	Notional Amount	Fixed Interest Rate	Underlying Rate	Expiration Date	Fair Value
Interest Rate Swap	$ 2,074	5.075%	3 month LIBOR	July 1, 2015	$ (100)
Interest Rate Swap	4,284	5.075%	3 month LIBOR	July 1, 2015	(205)
Interest Rate Swap	7,444	5.39%	1 month LIBOR	December 31, 2014	(326)
Interest Rate Swap	1,439	5.39%	1 month LIBOR	December 31, 2014	(63)
Interest Rate Swap	2,561	5.39%	1 month LIBOR	December 31, 2014	(112)
Interest Rate Swap	5,796	5.39%	1 month LIBOR	December 31, 2014	(254)
Interest Rate Swap	5,304	5.38%	1 month LIBOR	June 29, 2015	(304)
Interest Rate Swap	816	5.29%	1 month LIBOR	June 30, 2015	(47)
Interest Rate Swap	1,564	5.29%	1 month LIBOR	June 30, 2015	(89)
Interest Rate Swap	7,888	5.29%	1 month LIBOR	June 30, 2015	(448)
Interest Rate Swap	680	5.29%	1 month LIBOR	June 30, 2015	(39)
Interest Rate Swap	2,734	5.29%	1 month LIBOR	June 30, 2015	(155)

Fair values of derivative instruments are on the accompanying Consolidated Balance Sheet as of September 30, 2012 (in thousands):

		Fair Value at
Derivative Liabilities Designated as Hedging Instruments	Balance Sheet Location	September 30, 2012		December 31, 2011
Interest Rate Swaps	Other Long-Term Liabilities	$	2,142	$	2,233

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Number 107
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Reference 8: http://www.xbrl.org/2003/role/presentationRef
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Reference 9: http://www.xbrl.org/2003/role/presentationRef
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Reference 13: http://www.xbrl.org/2003/role/presentationRef
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+ Details

Note 7 - Segment Information

9 Months Ended

Sep. 30, 2012

Segment Reporting Disclosure [Text Block]

7 – Segment Information

The Company currently has one reportable business segment, the Truck Segment. The Truck Segment operates a network of commercial vehicle dealerships that provide an integrated one-stop source for the commercial vehicle needs of its customers, including retail sales of new and used commercial vehicles; aftermarket parts, service and body shop facilities; and a wide array of financial services, including the financing of new and used commercial vehicle purchases, insurance products and truck leasing and rentals. The commercial vehicle dealerships are deemed a single reporting unit because they have similar economic characteristics. The Company's chief operating decision maker considers the entire Truck Segment, not individual dealerships, when making decisions about resources to be allocated to the segment and assess its performance.

The accounting policies of the segments are the same as those described in the summary of significant accounting policies. The Company evaluates performance based on income before income taxes not including extraordinary items.

The following table contains summarized information about reportable segment revenue, segment income or loss and segment assets for the periods ended September 30, 2012 and 2011 (in thousands):

	Truck Segment		All Other			Totals

As of and for the three months ended September 30, 2012

Revenues from external customers	$	740,392	$	4,741		$	745,133
Segment income (loss) before taxes		24,704		(460	)		24,244
Segment assets		1,835,675		27,253			1,862,928

For the nine months ended September 30, 2012

Revenues from external customers	$	2,344,073	$	14,233		$	2,358,306
Segment income (loss) before taxes		79,521		(642	)		78,879

As of and for the three months ended September 30, 2011

Revenues from external customers	$	691,469	$	4,976		$	696,445
Segment income (loss) before taxes		26,875		(441	)		26,434
Segment assets		1,459,161		26,017			1,485,178

For the nine months ended September 30, 2011

Revenues from external customers	$	1,791,099	$	13,432		$	1,804,531
Segment income (loss) before taxes		59,481		(1,237	)		58,244

Revenues from segments below the quantitative thresholds are attributable to three operating segments of the Company and are included in the All Other column. Those segments include a retail tire company, an insurance agency and a guest ranch operation. None of those segments has ever met any of the quantitative thresholds for determining reportable segments.

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 131
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Note 8 - Income Taxes

9 Months Ended

Sep. 30, 2012

Income Tax Disclosure [Text Block]

8 – Income Taxes

The Company included accruals for unrecognized income tax benefits totaling $1.3 million as a component of accrued liabilities as of September 30, 2012, and December 31, 2011. The unrecognized tax benefits of $1.3 million at September 30, 2012, if recognized, would impact the Company's effective tax rate. An unfavorable settlement would require a charge to income tax expense and a favorable resolution would be recognized as a reduction to income tax expense. As of September 30, 2012, $51,000 of accrued interest related to unrecognized tax benefits is included in the provision for income taxes. No amounts were accrued for penalties.

The Company does not anticipate a significant change in the amount of unrecognized tax benefits in the next 12 months. As of September 30, 2012, the tax years ended December 31, 2008 through 2011, remained subject to audit by federal tax authorities and the tax years ended December 31, 2007 through 2011, remained subject to audit by state tax authorities.

- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h))
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
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-Name Regulation S-X (SX)
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+ Details

Note 2 - Goodwill and Other Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2012

Schedule of Goodwill [Table Text Block]

Change in the Carrying Amount of Goodwill

Balance January 1, 2012	$	182,612
Adjustment to acquisition of Peck Road Ford		36
Adjustment for franchise rights related to West Texas Peterbilt acquisition		(1,730	)
Balance September 30, 2012	$	180,918

- Definition

Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule.

+ References + Details

Note 4 - Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2012

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

Basic and Diluted Earnings Per Share

	Three Months Ended September 30,				Nine Months Ended September 30,
	2012		2011		2012		2011
Numerator:
Numerator for basic and diluted earnings per share – Net income available to common shareholders	$	14,909,000	$	16,045,000	$	48,237,000	$	35,830,000

Denominator–
Denominator for basic earnings per share – weighted average shares outstanding		38,740,275		37,932,300		38,602,099		37,796,072
Effect of dilutive securities– Employee and director stock options and restricted share awards		861,913		1,026,598		1,030,779		1,159,396
Denominator for diluted earnings per share – adjusted weighted average shares outstanding and assumed conversions		39,602,188		38,958,898		39,632,878		38,955,468

Basic earnings per common share	$	.38	$	.42	$	1.25	$	.95

Diluted earnings per common share and common share equivalents	$	.38	$	.41	$	1.22	$	.92

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]

Options to Purchase Shares of Common Stock

Three Months Ended

September 30,

Nine months Ended

September 30,

2012

2011

2012

2011

Anti-dilutive options

1,367,044

684,645

1,126,795

536,100

Note 6 - Financial Instruments and Fair Value (Tables)

9 Months Ended

Sep. 30, 2012

Fair Value, Assets Measured on Recurring Basis [Table Text Block]

At September 30, 2012

Fair Value Estimated Using

Cost Basis
Amount

Level 1
Inputs

Level 2
Inputs

Level 3
Inputs

Investment in auction rate securities

7,575

−

6,628

At December 31, 2011

Fair Value Estimated Using

Cost Basis
Amount

Level 1
Inputs

Level 2
Inputs

Level 3
Inputs

Investment in auction rate securities

7,575

−

6,628

Schedule of Derivative Instruments [Table Text Block]

Agreement	Notional Amount	Fixed Interest Rate	Underlying Rate	Expiration Date	Fair Value
Interest Rate Swap	$ 2,074	5.075%	3 month LIBOR	July 1, 2015	$ (100)
Interest Rate Swap	4,284	5.075%	3 month LIBOR	July 1, 2015	(205)
Interest Rate Swap	7,444	5.39%	1 month LIBOR	December 31, 2014	(326)
Interest Rate Swap	1,439	5.39%	1 month LIBOR	December 31, 2014	(63)
Interest Rate Swap	2,561	5.39%	1 month LIBOR	December 31, 2014	(112)
Interest Rate Swap	5,796	5.39%	1 month LIBOR	December 31, 2014	(254)
Interest Rate Swap	5,304	5.38%	1 month LIBOR	June 29, 2015	(304)
Interest Rate Swap	816	5.29%	1 month LIBOR	June 30, 2015	(47)
Interest Rate Swap	1,564	5.29%	1 month LIBOR	June 30, 2015	(89)
Interest Rate Swap	7,888	5.29%	1 month LIBOR	June 30, 2015	(448)
Interest Rate Swap	680	5.29%	1 month LIBOR	June 30, 2015	(39)
Interest Rate Swap	2,734	5.29%	1 month LIBOR	June 30, 2015	(155)

Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]

		Fair Value at
Derivative Liabilities Designated as Hedging Instruments	Balance Sheet Location	September 30, 2012		December 31, 2011
Interest Rate Swaps	Other Long-Term Liabilities	$	2,142	$	2,233

- Definition

Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).

+ References + Details

- Definition

Tabular disclosure of pertinent information about a derivative or group of derivatives on a disaggregated basis, such as for individual instruments, or small groups of similar instruments. May include a combination of the type of instrument, risks being hedged, notional amount, hedge designation, related hedged item, inception date, maturity date, or other relevant item.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959

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-Paragraph 1
-Subparagraph (SX 210.4-08.(n)(2))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

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+ Details

Note 7 - Segment Information (Tables)

9 Months Ended

Sep. 30, 2012

Schedule of Segment Reporting Information, by Segment [Table Text Block]

	Truck Segment		All Other			Totals

As of and for the three months ended September 30, 2012

Revenues from external customers	$	740,392	$	4,741		$	745,133
Segment income (loss) before taxes		24,704		(460	)		24,244
Segment assets		1,835,675		27,253			1,862,928

For the nine months ended September 30, 2012

Revenues from external customers	$	2,344,073	$	14,233		$	2,358,306
Segment income (loss) before taxes		79,521		(642	)		78,879

As of and for the three months ended September 30, 2011

Revenues from external customers	$	691,469	$	4,976		$	696,445
Segment income (loss) before taxes		26,875		(441	)		26,434
Segment assets		1,459,161		26,017			1,485,178

For the nine months ended September 30, 2011

Revenues from external customers	$	1,791,099	$	13,432		$	1,804,531
Segment income (loss) before taxes		59,481		(1,237	)		58,244

- Definition

Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.

+ References + Details

Note 2 - Goodwill and Other Intangible Assets (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Jun. 30, 2012	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Franchise Rights [Member]
Other Assets, Noncurrent	$ 4,500		$ 4,500		$ 2,800
Computer Software, Intangible Asset [Member]
Other Assets, Noncurrent	41,000		41,000
Finite-Lived Intangible Assets, Accumulated Amortization	3,300		3,300
Depreciation, Depletion and Amortization	700		$ 2,200
Finite-Lived Intangible Asset, Useful Life			15 years
Amortization of Intangible Assets			$ 2,900
Other Assets, Noncurrent	$ 48,455		48,455		$ 48,789
Depreciation, Depletion and Amortization			$ 53,196	$ 41,220
Goodwill, Purchase Accounting Adjustments		$ 1,700

Note 2 - Goodwill and Other Intangible Assets (Detail) - Goodwill $ in Thousands	9 Months Ended
	Sep. 30, 2012 USD ($)
Acquisition of Peck Road Ford [Member]
Adjustment to goodwill	$ 36
West Texas Peterbilt Acquisition [Member]
Adjustment to goodwill	(1,730)
Balance January 1, 2012	182,612
Balance September 30, 2012	$ 180,918

- Definition

Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-SubTopic 20
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-Paragraph 1
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-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 45
-Subparagraph e
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-Clause 1
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Reference 8: http://www.xbrl.org/2003/role/presentationRef
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Note 4 - Earnings Per Share (Detail) - Basic and Diluted Earnings Per Share - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Numerator:
Numerator for basic and diluted earnings per share – Net income available to common shareholders (in Dollars)	$ 14,909,000	$ 16,045,000	$ 48,237,000	$ 35,830,000
Denominator–
Denominator for basic earnings per share – weighted average shares outstanding	38,740,275	37,932,300	38,602,099	37,796,072
Effect of dilutive securities– Employee and director stock options and restricted share awards	861,913	1,026,598	1,030,779	1,159,396
Denominator for diluted earnings per share – adjusted weighted average shares outstanding and assumed conversions	39,602,188	38,958,898	39,632,878	38,955,468
Basic earnings per common share (in Dollars per share)	$ 0.38	$ 0.42	$ 1.25	$ 0.95
Diluted earnings per common share and common share equivalents (in Dollars per share)	$ 0.38	$ 0.41	$ 1.22	$ 0.92

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

+ References

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-Paragraph 2
-Subparagraph (SX 210.5-03.21)
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Reference 11: http://www.xbrl.org/2003/role/presentationRef
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-Number 210
-Section 04
-Paragraph 21
-Article 9

+ Details

- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

+ References + Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6518256

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-URI http://asc.fasb.org/extlink&oid=6519514

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-Paragraph 38
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-Paragraph A7
-Appendix A

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-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph 20
-Article 9

+ Details

- Definition

The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

+ References + Details

- Definition

Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Paragraph 1
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+ Details

Note 4 - Earnings Per Share (Detail) - Options to Purchase Common Stock - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Stock Options [Member]
Anti-dilutive options	1,367,044	684,645	1,126,795	536,100

- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Glossary Antidilution
-URI http://asc.fasb.org/extlink&oid=6505113

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-Name Accounting Standards Codification
-Glossary Diluted Earnings Per Share
-URI http://asc.fasb.org/extlink&oid=6510752

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-Name Accounting Standards Codification
-Glossary Contingent Stock Agreement
-URI http://asc.fasb.org/extlink&oid=6508534

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-Name Accounting Standards Codification
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-Number 128
-Paragraph 13, 14
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 07-4
-Paragraph 4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 171
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Note 5 - Stock Options and Restricted Stock Awards (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Share-based Compensation	$ 1,200	$ 900	$ 6,045	$ 4,756
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	$ 11,500		$ 11,500
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition			2 years 73 days

Note 6 - Financial Instruments and Fair Value (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2011	Sep. 30, 2012
Available-for-sale Securities, Debt Securities, Noncurrent	$ 6,628	$ 6,628
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis		$ 7,600
Derivative, Basis Spread on Variable Rate (in Basis Points)		2.25%
Asset Impairment Charges	1,000
Notional Amount of Interest Rate Cash Flow Hedge Derivatives		$ 42,600
Interest Rate Cash Flow Hedge Liability at Fair Value	$ 2,233	$ 2,142

- Definition

Total of debt securities categorized neither as held-to-maturity nor trading which are intended be sold or mature more than one year from the balance sheet date or operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=7534914&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 16
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 13
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 22
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FAS115-1/124-1
-Paragraph 15E
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 17
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FAS115-1/124-1
-Paragraph 15C
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 12
-Subparagraph b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FAS115-1/124-1
-Paragraph 15D
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Note 6 - Financial Instruments and Fair Value (Detail) - Investment in Auction Rate Securities - USD ($) $ in Thousands	Sep. 30, 2012	Dec. 31, 2011
Cost Basis Amount	$ 7,575	$ 7,575
Fair Value	$ 6,628	$ 6,628

- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

+ References + Details

Note 6 - Financial Instruments and Fair Value (Detail) - Derivative Financial Instruments $ in Thousands	9 Months Ended
	Sep. 30, 2012 USD ($)
Interest Rate Swap Agreement 1 [Member]
Notional Amount	$ 2,074
Fixed Interest Rate	5.075%
Underlying Rate	3 month LIBOR
Expiration Date	Jul. 01, 2015
Fair Value	$ (100)
Interest Rate Swap Agreement 2 [Member]
Notional Amount	$ 4,284
Fixed Interest Rate	5.075%
Underlying Rate	3 month LIBOR
Expiration Date	Jul. 01, 2015
Fair Value	$ (205)
Interest Rate Swap Agreement 3 [Member]
Notional Amount	$ 7,444
Fixed Interest Rate	5.39%
Underlying Rate	1 month LIBOR
Expiration Date	Dec. 31, 2014
Fair Value	$ (326)
Interest Rate Swap Agreement 4 [Member]
Notional Amount	$ 1,439
Fixed Interest Rate	5.39%
Underlying Rate	1 month LIBOR
Expiration Date	Dec. 31, 2014
Fair Value	$ (63)
Interest Rate Swap Agreement 5 [Member]
Notional Amount	$ 2,561
Fixed Interest Rate	5.39%
Underlying Rate	1 month LIBOR
Expiration Date	Dec. 31, 2014
Fair Value	$ (112)
Interest Rate Swap Agreement 6 [Member]
Notional Amount	$ 5,796
Fixed Interest Rate	5.39%
Underlying Rate	1 month LIBOR
Expiration Date	Dec. 31, 2014
Fair Value	$ (254)
Interest Rate Swap Agreement 7 [Member]
Notional Amount	$ 5,304
Fixed Interest Rate	5.38%
Underlying Rate	1 month LIBOR
Expiration Date	Jun. 29, 2015
Fair Value	$ (304)
Interest Rate Swap Agreement 8 [Member]
Notional Amount	$ 816
Fixed Interest Rate	5.29%
Underlying Rate	1 month LIBOR
Expiration Date	Jun. 30, 2015
Fair Value	$ (47)
Interest Rate Swap Agreement 9 [Member]
Notional Amount	$ 1,564
Fixed Interest Rate	5.29%
Underlying Rate	1 month LIBOR
Expiration Date	Jun. 30, 2015
Fair Value	$ (89)
Interest Rate Swap Agreement 10 [Member]
Notional Amount	$ 7,888
Fixed Interest Rate	5.29%
Underlying Rate	1 month LIBOR
Expiration Date	Jun. 30, 2015
Fair Value	$ (448)
Interest Rate Swap Agreement 11 [Member]
Notional Amount	$ 680
Fixed Interest Rate	5.29%
Underlying Rate	1 month LIBOR
Expiration Date	Jun. 30, 2015
Fair Value	$ (39)
Interest Rate Swap Agreement 12 [Member]
Notional Amount	$ 2,734
Fixed Interest Rate	5.29%
Underlying Rate	1 month LIBOR
Expiration Date	Jun. 30, 2015
Fair Value	$ (155)
Notional Amount	$ 42,600

Note 6 - Financial Instruments and Fair Value (Detail) - Fair Values of Derivative Instruments - USD ($) $ in Thousands	Sep. 30, 2012	Dec. 31, 2011
Interest Rate Swaps	$ 2,142	$ 2,233

Note 7 - Segment Information (Detail)	9 Months Ended
Note 7 - Segment Information (Detail)	Sep. 30, 2012
Number of Reportable Segments	1
Number of Operating Segments	3

Note 7 - Segment Information (Detail) - Segment Reporting Information - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Truck Segment [Member]
Revenues from external customers	$ 740,392	$ 691,469	$ 2,344,073	$ 1,791,099
Segment income (loss) from continuing operations before taxes	24,704	26,875	79,521	59,481
As of and for the three months ended September 30, 2011
Segment assets	1,835,675	1,459,161	1,835,675	1,459,161
All Other Segments [Member]
Revenues from external customers	4,741	4,976	14,233	13,432
Segment income (loss) from continuing operations before taxes	(460)	(441)	(642)	(1,237)
As of and for the three months ended September 30, 2011
Segment assets	27,253	26,017	27,253	26,017
Revenues from external customers	745,133	696,445	2,358,306	1,804,531
Segment income (loss) from continuing operations before taxes	24,244	26,434	78,879	58,244
Segment assets	$ 1,862,928	$ 1,485,178	$ 1,862,928	$ 1,485,178	$ 1,717,701

Note 8 - Income Taxes (Detail)	9 Months Ended
Note 8 - Income Taxes (Detail)	Sep. 30, 2012 USD ($)
Unrecognized Tax Benefits	$ 1,300,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	1,300,000
Unrecognized Tax Benefits, Interest on Income Taxes Expense	$ 51,000